19959445f5
Add the case to the iotest #214 that checks possibility of writing compressed data of more than one cluster size. The test case involves the compress filter driver showing a sample usage of that. Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Message-id: 1575288906-551879-4-git-send-email-andrey.shinkevich@virtuozzo.com Signed-off-by: Max Reitz <mreitz@redhat.com>
140 lines
5.2 KiB
Bash
Executable File
140 lines
5.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Test qcow2 image compression
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#
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# Copyright (C) 2018 Igalia, S.L.
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# Author: Alberto Garcia <berto@igalia.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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seq=$(basename "$0")
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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_supported_fmt qcow2
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_supported_proto file
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# Repairing the corrupted image requires qemu-img check to store a
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# refcount up to 3, which requires at least two refcount bits.
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# External data files do not support compressed clusters.
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_unsupported_imgopts 'refcount_bits=1[^0-9]' data_file
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echo
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echo "=== Corrupted size field in compressed cluster descriptor ==="
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echo
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# Create an empty image and fill half of it with compressed data.
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# The L2 entries of the two compressed clusters are located at
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# 0x800000 and 0x800008, their original values are 0x4008000000a00000
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# and 0x4008000000a00802 (5 sectors for compressed data each).
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_make_test_img 8M -o cluster_size=2M
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$QEMU_IO -c "write -c -P 0x11 0 2M" -c "write -c -P 0x11 2M 2M" "$TEST_IMG" \
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2>&1 | _filter_qemu_io | _filter_testdir
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# Reduce size of compressed data to 4 sectors: this corrupts the image.
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poke_file "$TEST_IMG" $((0x800000)) "\x40\x06"
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# 'qemu-img check' however doesn't see anything wrong because it
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# doesn't try to decompress the data and the refcounts are consistent.
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# TODO: update qemu-img so this can be detected.
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_check_test_img
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# Increase size of compressed data to the maximum (8192 sectors).
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# This makes QEMU read more data (8192 sectors instead of 5, host
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# addresses [0xa00000, 0xdfffff]), but the decompression algorithm
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# stops once we have enough to restore the uncompressed cluster, so
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# the rest of the data is ignored.
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poke_file "$TEST_IMG" $((0x800000)) "\x7f\xfe"
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# Do it also for the second compressed cluster (L2 entry at 0x800008).
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# In this case the compressed data would span 3 host clusters
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# (host addresses: [0xa00802, 0xe00801])
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poke_file "$TEST_IMG" $((0x800008)) "\x7f\xfe"
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# Here the image is too small so we're asking QEMU to read beyond the
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# end of the image.
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# But if we grow the image we won't be reading beyond its end anymore.
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$QEMU_IO -c "write -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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# The refcount data is however wrong because due to the increased size
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# of the compressed data it now reaches the following host clusters.
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# This can be repaired by qemu-img check by increasing the refcount of
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# those clusters.
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# TODO: update qemu-img to correct the compressed cluster size instead.
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_check_test_img -r all
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$QEMU_IO -c "read -P 0x11 0 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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$QEMU_IO -c "read -P 0x22 4M 4M" "$TEST_IMG" 2>&1 | _filter_qemu_io | _filter_testdir
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echo
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echo "=== Write compressed data of multiple clusters ==="
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echo
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cluster_size=0x10000
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_make_test_img 2M -o cluster_size=$cluster_size
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echo "Write uncompressed data:"
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let data_size="8 * $cluster_size"
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$QEMU_IO -c "write -P 0xaa 0 $data_size" "$TEST_IMG" \
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2>&1 | _filter_qemu_io | _filter_testdir
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sizeA=$($QEMU_IMG info --output=json "$TEST_IMG" |
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sed -n '/"actual-size":/ s/[^0-9]//gp')
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_make_test_img 2M -o cluster_size=$cluster_size
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echo "Write compressed data:"
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let data_size="3 * $cluster_size + $cluster_size / 2"
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# Set compress on. That will align the written data
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# by the cluster size and will write them compressed.
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QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT \
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$QEMU_IO -c "write -P 0xbb 0 $data_size" --image-opts \
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"driver=compress,file.driver=$IMGFMT,file.file.driver=file,file.file.filename=$TEST_IMG" \
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2>&1 | _filter_qemu_io | _filter_testdir
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let offset="4 * $cluster_size + $cluster_size / 4"
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QEMU_IO_OPTIONS=$QEMU_IO_OPTIONS_NO_FMT \
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$QEMU_IO -c "write -P 0xcc $offset $data_size" "json:{\
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'driver': 'compress',
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'file': {'driver': '$IMGFMT',
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'file': {'driver': 'file',
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'filename': '$TEST_IMG'}}}" | \
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_filter_qemu_io | _filter_testdir
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sizeB=$($QEMU_IMG info --output=json "$TEST_IMG" |
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sed -n '/"actual-size":/ s/[^0-9]//gp')
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if [ $sizeA -le $sizeB ]
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then
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echo "Compression ERROR"
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fi
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$QEMU_IMG check --output=json "$TEST_IMG" |
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sed -n 's/,$//; /"compressed-clusters":/ s/^ *//p'
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# success, all done
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echo '*** done'
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rm -f $seq.full
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status=0
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